University of British Columbia, Vancouver, Canada
Abstract:
Non-centrosymmetric (NCS) materials can host triplet superconductivity due to antisymmetric spin-orbit coupling (ASOC) that splits the degeneracy of spin-up and spin-down bands. We explore LaRhGe3 crystalizing in the NCS space group I4mm. I present our discovery of Type-I superconductivity with evidence from heat capacity and μSR experiments, with a critical temperature Tc of 0.385 K and critical field Hc of 2.1 mT [3]. Despite the strong ASOC in LaRhGe3, we do not detect any evidence for triplet state in our zero-field μSR experiment. Above the onset of superconductivity, LaRhGe3 exhibits an unusual temperature dependence in its resistivity, ρ ~ T 3, suggestive of strong electron-phonon interactions. In low T Raman spectroscopy we find the lowest energy A1 phonon is dominated by phonon-electron scattering instead of anharmonic decay. These results open up the investigation of electron-phonon interactions in the normal state of non-centrosymmetric semimetals.
Reference:
[1] E. Bauer & M. Sigrist Non-Centrosymmetric Superconductors: Introduction and Overview (Springer, 2012).
[2] T. Kawai et al., JPSJ 77, 064717 (2008).
[3] M. Oudah, et al., npj Quantum Mater., 9, 88 (2024)
Bio:
Mohamed Oudah is a Research Associate at the Quantum Matter Institute (QMI), University of British Columbia, Canada, where he works on the synthesis and discovery of novel quantum materials, including high-entropy oxides and correlated systems. Dr. Oudah earned his Ph.D. in Physics from Kyoto University for his work on superconductivity in antiperovskite oxides. He also holds an M.Sc. in Chemistry–Nanotechnology from the University of Waterloo and a B.Eng. in Chemical Engineering from the University of Ottawa. His research background includes positions at Princeton University, the Max Planck Institute for Solid State Research in Stuttgart, and Kyoto University. He has received the MEXT Research Scholarship. He has more than 30 publications, including NM, PRX, NC etc.
地点：M249会议室
邀请人：李西阳（82649427，xiyang.li@iphy.ac.cn）